Method for testing and evaluating comprehensive performance of navigation terminal based on microwave anechoic chamber

Abstract

The invention relates to a navigation terminal comprehensive performance test and evaluation method based on a microwave anechoic chamber, and belongs to the technical field of satellite navigation. The navigation terminal comprehensive performance test platform based on the microwave anechoic chamber is constructed, the navigation terminal comprehensive performance test scene is constructed, and the use conditions of the navigation terminal in actual use and various possible scenes are simulated for testing; and comprehensive performance evaluation is carried out according to the positioning / short message communication information reported by the navigation terminal. Through the comprehensive test scene formed by a plurality of application scenes, the scenes possibly encountered by the tested terminal in practical application are simulated, the test result is closer to the practical application, and the method has better practical application value.

Description

Technical Field

[0001] The present invention is mainly applied to the field of satellite navigation, and in particular relates to a comprehensive performance test and evaluation method for a navigation terminal in a microwave darkroom. Background Art

[0002] With the development of Beidou satellites to systems, Beidou navigation terminals have been widely used in various military services. Traditional navigation terminal testing is basically based on test evaluation of multiple test items in a darkroom environment. During the test process, it is necessary to perform multiple power on and off and command interactions with the navigation terminal under test, which cannot fully reflect the performance of the terminal under actual use conditions. Therefore, based on the test conditions of the microwave darkroom, by constructing a comprehensive performance test scenario for the navigation terminal, the actual use conditions and various scenarios that may be encountered in the navigation terminal are simulated for testing, and a comprehensive performance evaluation is performed based on the positioning / short message communication information reported by the navigation terminal. Summary of the invention

[0003] The purpose of the present invention is to design a comprehensive performance evaluation method for navigation terminals based on microwave darkrooms by constructing a comprehensive performance test scenario for navigation terminals, in view of the problem that the original performance test of navigation terminals based on microwave darkrooms is based on the test items of navigation terminals and cannot reflect the performance of navigation terminals under actual use conditions. The present invention is based on microwave darkroom conditions and simulates the actual working conditions and environment of navigation terminals to achieve test and evaluation of the comprehensive performance of navigation terminals. Compared with the test and evaluation based on traditional test items in microwave darkrooms, the present invention has the characteristics of "no sense" of the tested terminal during the test process and the test results are closer to actual applications, and has good practical application value.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A method for testing and evaluating the comprehensive performance of a navigation terminal based on a microwave darkroom specifically comprises the following steps:

[0006] Step 1: Build a comprehensive performance test platform for navigation terminals based on a microwave darkroom;

[0007] Step 2: construct a comprehensive performance test scenario for the navigation terminal, which covers various scenarios that the navigation terminal may encounter in actual use;

[0008] Step 3: The test evaluation software broadcasts the navigation terminal comprehensive performance test scenario by controlling the navigation signal simulator, the interference signal simulator and the test turntable, and the inbound signal processing device receives the inbound signal transmitted by the terminal under test;

[0009] Step 4: The antenna of the navigation terminal under test is installed on the test turntable in the microwave darkroom, the equipment is powered on, the navigation signal broadcast by the navigation signal simulator, the narrowband / broadband interference signal broadcast by the interference signal simulator are received, the test turntable simulates the change of the pitch angle when the navigation terminal under test moves, and the positioning / short message communication information is reported to the test evaluation software;

[0010] Step 5: The test evaluation software receives the positioning / short message communication information reported by the navigation terminal under test, and the inbound signal processing device receives the inbound telegram information transmitted by the navigation terminal under test, and compares them with the short message information set in the comprehensive performance test scenario of the navigation terminal to realize the evaluation of the comprehensive performance of the navigation terminal.

[0011] Furthermore, the navigation terminal comprehensive performance test platform in step 1 includes a test evaluation device, a navigation signal simulator, an interference signal simulator, an inbound signal processing device, a microwave darkroom, a test turntable and a navigation terminal under test;

[0012] The navigation simulator is used to simulate the satellite navigation signal received by the navigation terminal in the actual sky situation;

[0013] The interference signal simulator is used to simulate the interference signal received by the navigation terminal in actual application;

[0014] The inbound signal processing device is used to capture, track, demodulate, decode and obtain the observed amount of the short message signal transmitted by the navigation terminal under test, and package the relevant information to the test and evaluation device;

[0015] The microwave darkroom provides a clean electromagnetic environment for the navigation terminal under test, and a test antenna is installed inside for transmitting navigation signals, receiving inbound signals, and transmitting interference signals;

[0016] The test turntable is used to install the antenna of the navigation terminal under test and simulate the changes of the azimuth and elevation angles of the antenna of the navigation terminal under test during the actual application process;

[0017] The navigation terminal under test refers to a receiver with Beidou or other navigation system navigation signals, and has positioning function or short message communication function;

[0018] The test and evaluation equipment is used to control the navigation signal simulator, interference signal simulator, inbound signal processing equipment, test turntable, and navigation terminal under test, as well as to collect test data, and to achieve comprehensive performance evaluation of the navigation terminal under test through analysis.

[0019] The test and evaluation equipment realizes the broadcast of the navigation terminal comprehensive performance test scenario by controlling the navigation signal simulator, the interference signal simulator and the test turntable. The inbound signal processing equipment receives the inbound signal transmitted by the navigation terminal under test. The antenna of the navigation terminal under test is installed on the test turntable in the microwave darkroom. The equipment is powered on to receive the navigation signal broadcast by the navigation signal simulator, the narrowband / wideband interference signal broadcast by the interference signal simulator, and the test turntable simulates the change of the pitch angle of the navigation terminal under test during movement, and reports the positioning / short message communication information to the test and evaluation equipment. The test and evaluation equipment receives the positioning / short message communication information reported by the navigation terminal under test, and the inbound signal processing equipment receives the inbound telegram information transmitted by the navigation terminal under test, and compares them with the information set in the navigation terminal comprehensive performance test scenario to realize the evaluation of the comprehensive performance of the navigation terminal.

[0020] Furthermore, the process of constructing the navigation terminal comprehensive performance test scenario in step 2 is as follows:

[0021] Step 1, determine the type of navigation terminal to be tested, and analyze various scenarios that the terminal of this type may encounter in actual use;

[0022] Step 2, determining stress parameters of the navigation terminal under test in various scenarios;

[0023] Step 3: Build a comprehensive test scenario for the navigation terminal, covering various scenarios encountered in the actual use of this type of navigation terminal, including terminal startup, signal blocking, narrowband / wideband interference, rain attenuation, and terminal shutdown.

[0024] Furthermore, the test and evaluation equipment receives the positioning and speed measurement information reported by the navigation terminal under test, and compares it with the positioning information set in the comprehensive performance test scenario, so as to complete the evaluation of the RNSS related performance of the navigation terminal under test; the test and evaluation equipment receives the short message communication information reported by the navigation terminal under test, and the inbound signal processing equipment receives the inbound telegram information transmitted by the navigation terminal under test, and compares it with the short message information set in the comprehensive performance test scenario, so as to complete the evaluation of the short message related performance of the navigation terminal under test; the test and evaluation equipment realizes the evaluation of the comprehensive performance of the navigation terminal through the evaluation results of the RNSS and short message related performance of the navigation terminal under test, combined with the stress parameters set in the comprehensive test scenario.

[0025] The technology of the present invention has the following advantages:

[0026] The present invention is based on the actual application scenarios of navigation terminals. Under microwave darkroom conditions, the actual working conditions and environment of navigation terminals are simulated to achieve test and evaluation of the comprehensive performance of navigation terminals. During the test, the actual working conditions are simulated, and the test and evaluation equipment no longer interacts with the tested navigation terminal for unnecessary commands. During the test, the tested navigation terminal is "unaware"; and the comprehensive test scenario formed by multiple application scenarios simulates the scenarios that the tested terminal may encounter in actual applications. The test results are closer to actual applications and have good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the comprehensive performance test platform of the navigation terminal.

[0028] Figure 2 It is a schematic diagram of a comprehensive test scenario constructed by the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments and accompanying drawings:

[0030] Reference Figure 1 and Figure 2 First, a comprehensive performance test platform for navigation terminals based on microwave darkroom is constructed, including: test evaluation equipment, navigation signal simulator, interference signal simulator, inbound signal processing equipment, microwave darkroom (including test antenna), test turntable, and navigation terminal under test; the functions implemented by each component are as follows

[0031] Test and evaluation equipment: mainly composed of a test and evaluation computer and supporting network data exchange equipment, as well as test and evaluation software deployed on the computer. It is used to control the navigation signal simulator, interference signal simulator, inbound signal processing equipment, test turntable, and the navigation terminal under test, as well as to collect test data, and ultimately achieve comprehensive performance evaluation of the navigation terminal under test.

[0032] Navigation signal simulator: used to simulate the satellite navigation signals received by the navigation terminal in the actual sky situation, including the RDSS outbound signal frequency;

[0033] Interference signal simulator: used to simulate the intentional or unintentional interference signals received by the navigation terminal in actual applications, including narrowband interference and suppression interference;

[0034] Inbound signal processing equipment: It has the functions of capturing, tracking, demodulating, decoding and obtaining observation quantities of short message signals transmitted by the navigation terminal under test, and packages the relevant information to the test and evaluation equipment.

[0035] Microwave darkroom (including test antenna): used to provide a clean electromagnetic space for the terminal under test. The test antenna installed inside is used to transmit navigation signals, receive inbound signals, and transmit interference signals;

[0036] Test turntable: used to install the antenna of the navigation terminal under test and simulate the changes of the azimuth and elevation angles of the navigation terminal antenna during the actual application of the terminal under test;

[0037] Navigation terminal under test: A navigation terminal with Beidou command function, which can realize the general functions of command machine such as receiving subordinate users, and also needs to support the editing of special fields of inbound telegrams, and have the ability to output the initial equal parameters of inbound spread spectrum signals.

[0038] Then, a comprehensive performance test scenario for the navigation terminal is constructed. The test scenario covers various scenarios that the navigation terminal may encounter in actual use, including navigation terminal startup, signal blocking, narrowband / wideband interference, rain attenuation, and navigation terminal shutdown. The process of constructing a comprehensive performance test scenario for the navigation terminal is as follows:

[0039] Step 1, determine the type of navigation terminal to be tested, and analyze various scenarios that may be encountered by this type of navigation terminal in actual use; taking the vehicle-mounted navigation terminal as an example, the scenarios in actual use generally include the navigation terminal starting up to search for navigation signals to achieve initial positioning, the positioning performance and short message communication performance of the navigation terminal under signal obstruction conditions caused by passing through a road with trees in summer, the positioning performance and short message communication performance of the navigation terminal under unintentional narrowband / wideband interference, the re-capture of the navigation signal after loss of lock caused by the navigation terminal passing through a tunnel, the positioning performance and short message communication performance of the navigation terminal under conditions of navigation signal power fading in rainy and snowy weather, and the navigation terminal device being shut down, etc.

[0040] Step 2: Determine the stress parameters of the navigation terminal in various application scenarios; for example, the navigation signal attenuation value and duration under signal blocking conditions, the frequency / type / intensity / duration of interference signals, the navigation signal loss time, the signal attenuation value / duration under rainy and snowy weather conditions, etc.

[0041] Step 3: Build a comprehensive test scenario for the navigation terminal, covering various scenarios encountered in the actual use of this type of navigation terminal, including terminal startup, signal blocking, narrowband / wideband interference, rain attenuation, terminal shutdown, etc.

[0042] After the test platform and test scenario are built, the test evaluation equipment broadcasts the navigation terminal comprehensive performance test scenario by controlling the navigation signal simulator, interference signal simulator and test turntable, and the inbound signal processing equipment receives the inbound signal transmitted by the terminal under test;

[0043] The antenna of the navigation terminal under test is installed on the test turntable in the microwave darkroom. The equipment is powered on to receive the navigation signal broadcast by the navigation signal simulator, the narrowband / broadband interference signal broadcast by the interference signal simulator, and the test turntable simulates the change of the pitch angle when the navigation terminal under test moves, and reports the positioning / short message communication information to the test evaluation equipment;

[0044] The test and evaluation equipment receives the positioning, speed measurement / short message communication information reported by the navigation terminal under test, and the inbound signal processing equipment receives the inbound telegram information transmitted by the navigation terminal under test, and compares them with the information set in the comprehensive performance test scenario of the navigation terminal to realize the evaluation of the comprehensive performance of the navigation terminal.

[0045] The comprehensive evaluation of the test and evaluation equipment is as follows:

[0046] Step 101, the test evaluation equipment receives the positioning information reported by the tested navigation terminal, compares it with the positioning information set in the comprehensive test scenario, and completes the evaluation of the RNSS related performance of the tested navigation terminal; completes the evaluation of the first positioning time performance of the tested navigation terminal when the terminal is turned on, completes the evaluation of the RDSS loss and recapture performance of the tested navigation terminal under signal shielding conditions, completes the evaluation of the anti-interference performance of the tested terminal under narrowband / wideband interference conditions, and completes the evaluation of the tracking sensitivity performance of the tested terminal under rain attenuation conditions;

[0047] Step 102, the test evaluation equipment receives the short message communication information reported by the tested navigation terminal, and the inbound signal processing equipment receives the inbound telegram information transmitted by the tested navigation terminal, and compares it with the short message information set in the comprehensive test scenario, to complete the evaluation of the short message related performance of the tested navigation terminal; when the terminal is turned on, the first capture performance of the tested navigation terminal and the terminal power-on report function are evaluated, and the RDSS loss-of-lock and re-capture performance of the tested navigation terminal is evaluated under signal blocking conditions, and the communication success rate of the tested terminal is evaluated under narrowband / wideband interference and rain attenuation conditions. When the equipment is shut down, the shutdown report function of the tested terminal is evaluated.

[0048] Step 103, the test evaluation device evaluates the comprehensive performance of the navigation terminal by combining the evaluation results of the RNSS and short message related performance of the navigation terminal under test with the stress parameters set in the comprehensive test scenario and the performance index requirements of the navigation terminal under test itself.

Claims

1. A navigation terminal comprehensive performance test and evaluation method based on a microwave darkroom, characterized in that: The specific steps include: Step 1: Build a comprehensive performance test platform for navigation terminals based on a microwave darkroom; Step 2: construct a comprehensive performance test scenario for the navigation terminal, which covers various scenarios that the navigation terminal may encounter in actual use; Step 3: The test evaluation software broadcasts the navigation terminal comprehensive performance test scenario by controlling the navigation signal simulator, the interference signal simulator and the test turntable, and the inbound signal processing device receives the inbound signal transmitted by the terminal under test; Step 4: The antenna of the navigation terminal under test is installed on the test turntable in the microwave darkroom, the equipment is powered on, the navigation signal broadcast by the navigation signal simulator, the narrowband / broadband interference signal broadcast by the interference signal simulator are received, the test turntable simulates the change of the pitch angle when the navigation terminal under test moves, and the positioning / short message communication information is reported to the test evaluation software; Step 5: The test evaluation software receives the positioning / short message communication information reported by the navigation terminal under test, and the inbound signal processing device receives the inbound telegram information transmitted by the navigation terminal under test, and compares them with the short message information set in the comprehensive performance test scenario of the navigation terminal to realize the evaluation of the comprehensive performance of the navigation terminal.

2. According to the method for comprehensive performance testing and evaluation of a navigation terminal based on a microwave darkroom in claim 1, it is characterized in that: The navigation terminal comprehensive performance test platform in step 1 includes test evaluation equipment, navigation signal simulator, interference signal simulator, inbound signal processing equipment, microwave darkroom, test turntable and navigation terminal under test; The navigation simulator is used to simulate the satellite navigation signal received by the navigation terminal in the actual sky situation; The interference signal simulator is used to simulate the interference signal received by the navigation terminal in actual application; The inbound signal processing device is used to capture, track, demodulate, decode and obtain the observed amount of the short message signal transmitted by the navigation terminal under test, and package the relevant information to the test and evaluation device; The microwave darkroom provides a clean electromagnetic environment for the navigation terminal under test, and a test antenna is installed inside for transmitting navigation signals, receiving inbound signals, and transmitting interference signals; The test turntable is used to install the antenna of the navigation terminal under test and simulate the changes of the azimuth and elevation angles of the antenna of the navigation terminal under test during the actual application process; The navigation terminal under test refers to a receiver with Beidou or other navigation system navigation signals, and has positioning function or short message communication function; The test and evaluation equipment is used to control the navigation signal simulator, interference signal simulator, inbound signal processing equipment, test turntable, and navigation terminal under test, as well as to collect test data, and to achieve comprehensive performance evaluation of the navigation terminal under test through analysis. The test and evaluation equipment broadcasts the navigation terminal comprehensive performance test scenario by controlling the navigation signal simulator, the interference signal simulator and the test turntable, and the inbound signal processing equipment receives the inbound signal transmitted by the navigation terminal under test; The antenna of the navigation terminal under test is installed on the test turntable in the microwave darkroom. The equipment is powered on and receives the navigation signal broadcast by the navigation signal simulator, the narrowband / wideband interference signal broadcast by the interference signal simulator, and the test turntable simulates the change of the pitch angle of the navigation terminal under test when it moves, and reports the positioning / short message communication information to the test and evaluation equipment; the test and evaluation equipment receives the positioning / short message communication information reported by the navigation terminal under test, and the inbound signal processing equipment receives the inbound telegram information transmitted by the navigation terminal under test, and compares them with the information set in the comprehensive performance test scenario of the navigation terminal to realize the evaluation of the comprehensive performance of the navigation terminal.

3. The method for comprehensive performance testing and evaluation of a navigation terminal based on a microwave darkroom according to claim 1 is characterized in that: The process of building the navigation terminal comprehensive performance test scenario in step 2 is as follows: Step 1, determine the type of navigation terminal to be tested, and analyze various scenarios that the terminal of this type may encounter in actual use; Step 2, determining stress parameters of the navigation terminal under test in various scenarios; Step 3: Build a comprehensive test scenario for the navigation terminal, covering various scenarios encountered in the actual use of this type of navigation terminal, including terminal startup, signal blocking, narrowband / wideband interference, rain attenuation, and terminal shutdown.

4. The method for comprehensive performance testing and evaluation of a navigation terminal based on a microwave darkroom according to claim 1 is characterized in that: The test and evaluation equipment receives the positioning and speed information reported by the navigation terminal under test, and compares it with the positioning information set in the comprehensive performance test scenario, to complete the evaluation of the RNSS related performance of the navigation terminal under test; the test and evaluation equipment receives the short message communication information reported by the navigation terminal under test, and the inbound signal processing equipment receives the inbound telegram information transmitted by the navigation terminal under test, and compares it with the short message information set in the comprehensive performance test scenario, to complete the evaluation of the short message related performance of the navigation terminal under test; the test and evaluation equipment realizes the evaluation of the comprehensive performance of the navigation terminal through the evaluation results of the RNSS and short message related performance of the navigation terminal under test, combined with the stress parameters set in the comprehensive test scenario.

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